4686821 has 2 divisors, whose sum is σ = 4686822. Its totient is φ = 4686820.

The previous prime is 4686817. The next prime is 4686839. The reversal of 4686821 is 1286864.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4669921 + 16900 = 2161^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 4686821 - 2² = 4686817 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4686811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2343410 + 2343411.

It is an arithmetic number, because the mean of its divisors is an integer number (2343411).

Almost surely, 2^4686821 is an apocalyptic number.

It is an amenable number.

4686821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4686821 is an equidigital number, since it uses as much as digits as its factorization.

4686821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 35.

The square root of 4686821 is about 2164.9066954490. The cubic root of 4686821 is about 167.3501563308.

The spelling of 4686821 in words is "four million, six hundred eighty-six thousand, eight hundred twenty-one".